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1 | /* -*- mode: c; c-basic-offset: 8; -*- |
2 | * vim: noexpandtab sw=8 ts=8 sts=0: | |
3 | * | |
4 | * file.c | |
5 | * | |
6 | * File open, close, extend, truncate | |
7 | * | |
8 | * Copyright (C) 2002, 2004 Oracle. All rights reserved. | |
9 | * | |
10 | * This program is free software; you can redistribute it and/or | |
11 | * modify it under the terms of the GNU General Public | |
12 | * License as published by the Free Software Foundation; either | |
13 | * version 2 of the License, or (at your option) any later version. | |
14 | * | |
15 | * This program is distributed in the hope that it will be useful, | |
16 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
17 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
18 | * General Public License for more details. | |
19 | * | |
20 | * You should have received a copy of the GNU General Public | |
21 | * License along with this program; if not, write to the | |
22 | * Free Software Foundation, Inc., 59 Temple Place - Suite 330, | |
23 | * Boston, MA 021110-1307, USA. | |
24 | */ | |
25 | ||
26 | #include <linux/fs.h> | |
27 | #include <linux/types.h> | |
28 | #include <linux/slab.h> | |
29 | #include <linux/highmem.h> | |
30 | #include <linux/pagemap.h> | |
31 | #include <linux/uio.h> | |
32 | ||
33 | #define MLOG_MASK_PREFIX ML_INODE | |
34 | #include <cluster/masklog.h> | |
35 | ||
36 | #include "ocfs2.h" | |
37 | ||
38 | #include "alloc.h" | |
39 | #include "aops.h" | |
40 | #include "dir.h" | |
41 | #include "dlmglue.h" | |
42 | #include "extent_map.h" | |
43 | #include "file.h" | |
44 | #include "sysfile.h" | |
45 | #include "inode.h" | |
46 | #include "journal.h" | |
47 | #include "mmap.h" | |
48 | #include "suballoc.h" | |
49 | #include "super.h" | |
50 | ||
51 | #include "buffer_head_io.h" | |
52 | ||
53 | static int ocfs2_sync_inode(struct inode *inode) | |
54 | { | |
55 | filemap_fdatawrite(inode->i_mapping); | |
56 | return sync_mapping_buffers(inode->i_mapping); | |
57 | } | |
58 | ||
59 | static int ocfs2_file_open(struct inode *inode, struct file *file) | |
60 | { | |
61 | int status; | |
62 | int mode = file->f_flags; | |
63 | struct ocfs2_inode_info *oi = OCFS2_I(inode); | |
64 | ||
65 | mlog_entry("(0x%p, 0x%p, '%.*s')\n", inode, file, | |
66 | file->f_dentry->d_name.len, file->f_dentry->d_name.name); | |
67 | ||
68 | spin_lock(&oi->ip_lock); | |
69 | ||
70 | /* Check that the inode hasn't been wiped from disk by another | |
71 | * node. If it hasn't then we're safe as long as we hold the | |
72 | * spin lock until our increment of open count. */ | |
73 | if (OCFS2_I(inode)->ip_flags & OCFS2_INODE_DELETED) { | |
74 | spin_unlock(&oi->ip_lock); | |
75 | ||
76 | status = -ENOENT; | |
77 | goto leave; | |
78 | } | |
79 | ||
80 | if (mode & O_DIRECT) | |
81 | oi->ip_flags |= OCFS2_INODE_OPEN_DIRECT; | |
82 | ||
83 | oi->ip_open_count++; | |
84 | spin_unlock(&oi->ip_lock); | |
85 | status = 0; | |
86 | leave: | |
87 | mlog_exit(status); | |
88 | return status; | |
89 | } | |
90 | ||
91 | static int ocfs2_file_release(struct inode *inode, struct file *file) | |
92 | { | |
93 | struct ocfs2_inode_info *oi = OCFS2_I(inode); | |
94 | ||
95 | mlog_entry("(0x%p, 0x%p, '%.*s')\n", inode, file, | |
96 | file->f_dentry->d_name.len, | |
97 | file->f_dentry->d_name.name); | |
98 | ||
99 | spin_lock(&oi->ip_lock); | |
100 | if (!--oi->ip_open_count) | |
101 | oi->ip_flags &= ~OCFS2_INODE_OPEN_DIRECT; | |
102 | spin_unlock(&oi->ip_lock); | |
103 | ||
104 | mlog_exit(0); | |
105 | ||
106 | return 0; | |
107 | } | |
108 | ||
109 | static int ocfs2_sync_file(struct file *file, | |
110 | struct dentry *dentry, | |
111 | int datasync) | |
112 | { | |
113 | int err = 0; | |
114 | journal_t *journal; | |
115 | struct inode *inode = dentry->d_inode; | |
116 | struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); | |
117 | ||
118 | mlog_entry("(0x%p, 0x%p, %d, '%.*s')\n", file, dentry, datasync, | |
119 | dentry->d_name.len, dentry->d_name.name); | |
120 | ||
121 | err = ocfs2_sync_inode(dentry->d_inode); | |
122 | if (err) | |
123 | goto bail; | |
124 | ||
125 | journal = osb->journal->j_journal; | |
126 | err = journal_force_commit(journal); | |
127 | ||
128 | bail: | |
129 | mlog_exit(err); | |
130 | ||
131 | return (err < 0) ? -EIO : 0; | |
132 | } | |
133 | ||
134 | int ocfs2_set_inode_size(struct ocfs2_journal_handle *handle, | |
135 | struct inode *inode, | |
136 | struct buffer_head *fe_bh, | |
137 | u64 new_i_size) | |
138 | { | |
139 | int status; | |
140 | ||
141 | mlog_entry_void(); | |
142 | i_size_write(inode, new_i_size); | |
143 | inode->i_blocks = ocfs2_align_bytes_to_sectors(new_i_size); | |
144 | inode->i_ctime = inode->i_mtime = CURRENT_TIME; | |
145 | ||
146 | status = ocfs2_mark_inode_dirty(handle, inode, fe_bh); | |
147 | if (status < 0) { | |
148 | mlog_errno(status); | |
149 | goto bail; | |
150 | } | |
151 | ||
152 | bail: | |
153 | mlog_exit(status); | |
154 | return status; | |
155 | } | |
156 | ||
157 | static int ocfs2_simple_size_update(struct inode *inode, | |
158 | struct buffer_head *di_bh, | |
159 | u64 new_i_size) | |
160 | { | |
161 | int ret; | |
162 | struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); | |
163 | struct ocfs2_journal_handle *handle = NULL; | |
164 | ||
165 | handle = ocfs2_start_trans(osb, NULL, | |
166 | OCFS2_INODE_UPDATE_CREDITS); | |
167 | if (handle == NULL) { | |
168 | ret = -ENOMEM; | |
169 | mlog_errno(ret); | |
170 | goto out; | |
171 | } | |
172 | ||
173 | ret = ocfs2_set_inode_size(handle, inode, di_bh, | |
174 | new_i_size); | |
175 | if (ret < 0) | |
176 | mlog_errno(ret); | |
177 | ||
178 | ocfs2_commit_trans(handle); | |
179 | out: | |
180 | return ret; | |
181 | } | |
182 | ||
183 | static int ocfs2_orphan_for_truncate(struct ocfs2_super *osb, | |
184 | struct inode *inode, | |
185 | struct buffer_head *fe_bh, | |
186 | u64 new_i_size) | |
187 | { | |
188 | int status; | |
189 | struct ocfs2_journal_handle *handle; | |
190 | ||
191 | mlog_entry_void(); | |
192 | ||
193 | /* TODO: This needs to actually orphan the inode in this | |
194 | * transaction. */ | |
195 | ||
196 | handle = ocfs2_start_trans(osb, NULL, OCFS2_INODE_UPDATE_CREDITS); | |
197 | if (IS_ERR(handle)) { | |
198 | status = PTR_ERR(handle); | |
199 | mlog_errno(status); | |
200 | goto out; | |
201 | } | |
202 | ||
203 | status = ocfs2_set_inode_size(handle, inode, fe_bh, new_i_size); | |
204 | if (status < 0) | |
205 | mlog_errno(status); | |
206 | ||
207 | ocfs2_commit_trans(handle); | |
208 | out: | |
209 | mlog_exit(status); | |
210 | return status; | |
211 | } | |
212 | ||
213 | static int ocfs2_truncate_file(struct inode *inode, | |
214 | struct buffer_head *di_bh, | |
215 | u64 new_i_size) | |
216 | { | |
217 | int status = 0; | |
218 | struct ocfs2_dinode *fe = NULL; | |
219 | struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); | |
220 | struct ocfs2_truncate_context *tc = NULL; | |
221 | ||
222 | mlog_entry("(inode = %"MLFu64", new_i_size = %"MLFu64"\n", | |
223 | OCFS2_I(inode)->ip_blkno, new_i_size); | |
224 | ||
225 | truncate_inode_pages(inode->i_mapping, new_i_size); | |
226 | ||
227 | fe = (struct ocfs2_dinode *) di_bh->b_data; | |
228 | if (!OCFS2_IS_VALID_DINODE(fe)) { | |
229 | OCFS2_RO_ON_INVALID_DINODE(inode->i_sb, fe); | |
230 | status = -EIO; | |
231 | goto bail; | |
232 | } | |
233 | ||
234 | mlog_bug_on_msg(le64_to_cpu(fe->i_size) != i_size_read(inode), | |
235 | "Inode %"MLFu64", inode i_size = %lld != di " | |
236 | "i_size = %"MLFu64", i_flags = 0x%x\n", | |
237 | OCFS2_I(inode)->ip_blkno, | |
238 | i_size_read(inode), | |
239 | le64_to_cpu(fe->i_size), le32_to_cpu(fe->i_flags)); | |
240 | ||
241 | if (new_i_size > le64_to_cpu(fe->i_size)) { | |
242 | mlog(0, "asked to truncate file with size (%"MLFu64") " | |
243 | "to size (%"MLFu64")!\n", | |
244 | le64_to_cpu(fe->i_size), new_i_size); | |
245 | status = -EINVAL; | |
246 | mlog_errno(status); | |
247 | goto bail; | |
248 | } | |
249 | ||
250 | mlog(0, "inode %"MLFu64", i_size = %"MLFu64", new_i_size = %"MLFu64"\n", | |
251 | le64_to_cpu(fe->i_blkno), le64_to_cpu(fe->i_size), new_i_size); | |
252 | ||
253 | /* lets handle the simple truncate cases before doing any more | |
254 | * cluster locking. */ | |
255 | if (new_i_size == le64_to_cpu(fe->i_size)) | |
256 | goto bail; | |
257 | ||
258 | if (le32_to_cpu(fe->i_clusters) == | |
259 | ocfs2_clusters_for_bytes(osb->sb, new_i_size)) { | |
260 | mlog(0, "fe->i_clusters = %u, so we do a simple truncate\n", | |
261 | fe->i_clusters); | |
262 | /* No allocation change is required, so lets fast path | |
263 | * this truncate. */ | |
264 | status = ocfs2_simple_size_update(inode, di_bh, new_i_size); | |
265 | if (status < 0) | |
266 | mlog_errno(status); | |
267 | goto bail; | |
268 | } | |
269 | ||
270 | /* This forces other nodes to sync and drop their pages */ | |
271 | status = ocfs2_data_lock(inode, 1); | |
272 | if (status < 0) { | |
273 | mlog_errno(status); | |
274 | goto bail; | |
275 | } | |
276 | ocfs2_data_unlock(inode, 1); | |
277 | ||
278 | /* alright, we're going to need to do a full blown alloc size | |
279 | * change. Orphan the inode so that recovery can complete the | |
280 | * truncate if necessary. This does the task of marking | |
281 | * i_size. */ | |
282 | status = ocfs2_orphan_for_truncate(osb, inode, di_bh, new_i_size); | |
283 | if (status < 0) { | |
284 | mlog_errno(status); | |
285 | goto bail; | |
286 | } | |
287 | ||
288 | status = ocfs2_prepare_truncate(osb, inode, di_bh, &tc); | |
289 | if (status < 0) { | |
290 | mlog_errno(status); | |
291 | goto bail; | |
292 | } | |
293 | ||
294 | status = ocfs2_commit_truncate(osb, inode, di_bh, tc); | |
295 | if (status < 0) { | |
296 | mlog_errno(status); | |
297 | goto bail; | |
298 | } | |
299 | ||
300 | /* TODO: orphan dir cleanup here. */ | |
301 | bail: | |
302 | ||
303 | mlog_exit(status); | |
304 | return status; | |
305 | } | |
306 | ||
307 | /* | |
308 | * extend allocation only here. | |
309 | * we'll update all the disk stuff, and oip->alloc_size | |
310 | * | |
311 | * expect stuff to be locked, a transaction started and enough data / | |
312 | * metadata reservations in the contexts. | |
313 | * | |
314 | * Will return -EAGAIN, and a reason if a restart is needed. | |
315 | * If passed in, *reason will always be set, even in error. | |
316 | */ | |
317 | int ocfs2_do_extend_allocation(struct ocfs2_super *osb, | |
318 | struct inode *inode, | |
319 | u32 clusters_to_add, | |
320 | struct buffer_head *fe_bh, | |
321 | struct ocfs2_journal_handle *handle, | |
322 | struct ocfs2_alloc_context *data_ac, | |
323 | struct ocfs2_alloc_context *meta_ac, | |
324 | enum ocfs2_alloc_restarted *reason_ret) | |
325 | { | |
326 | int status = 0; | |
327 | int free_extents; | |
328 | struct ocfs2_dinode *fe = (struct ocfs2_dinode *) fe_bh->b_data; | |
329 | enum ocfs2_alloc_restarted reason = RESTART_NONE; | |
330 | u32 bit_off, num_bits; | |
331 | u64 block; | |
332 | ||
333 | BUG_ON(!clusters_to_add); | |
334 | ||
335 | free_extents = ocfs2_num_free_extents(osb, inode, fe); | |
336 | if (free_extents < 0) { | |
337 | status = free_extents; | |
338 | mlog_errno(status); | |
339 | goto leave; | |
340 | } | |
341 | ||
342 | /* there are two cases which could cause us to EAGAIN in the | |
343 | * we-need-more-metadata case: | |
344 | * 1) we haven't reserved *any* | |
345 | * 2) we are so fragmented, we've needed to add metadata too | |
346 | * many times. */ | |
347 | if (!free_extents && !meta_ac) { | |
348 | mlog(0, "we haven't reserved any metadata!\n"); | |
349 | status = -EAGAIN; | |
350 | reason = RESTART_META; | |
351 | goto leave; | |
352 | } else if ((!free_extents) | |
353 | && (ocfs2_alloc_context_bits_left(meta_ac) | |
354 | < ocfs2_extend_meta_needed(fe))) { | |
355 | mlog(0, "filesystem is really fragmented...\n"); | |
356 | status = -EAGAIN; | |
357 | reason = RESTART_META; | |
358 | goto leave; | |
359 | } | |
360 | ||
361 | status = ocfs2_claim_clusters(osb, handle, data_ac, 1, | |
362 | &bit_off, &num_bits); | |
363 | if (status < 0) { | |
364 | if (status != -ENOSPC) | |
365 | mlog_errno(status); | |
366 | goto leave; | |
367 | } | |
368 | ||
369 | BUG_ON(num_bits > clusters_to_add); | |
370 | ||
371 | /* reserve our write early -- insert_extent may update the inode */ | |
372 | status = ocfs2_journal_access(handle, inode, fe_bh, | |
373 | OCFS2_JOURNAL_ACCESS_WRITE); | |
374 | if (status < 0) { | |
375 | mlog_errno(status); | |
376 | goto leave; | |
377 | } | |
378 | ||
379 | block = ocfs2_clusters_to_blocks(osb->sb, bit_off); | |
380 | mlog(0, "Allocating %u clusters at block %u for inode %"MLFu64"\n", | |
381 | num_bits, bit_off, OCFS2_I(inode)->ip_blkno); | |
382 | status = ocfs2_insert_extent(osb, handle, inode, fe_bh, block, | |
383 | num_bits, meta_ac); | |
384 | if (status < 0) { | |
385 | mlog_errno(status); | |
386 | goto leave; | |
387 | } | |
388 | ||
389 | le32_add_cpu(&fe->i_clusters, num_bits); | |
390 | spin_lock(&OCFS2_I(inode)->ip_lock); | |
391 | OCFS2_I(inode)->ip_clusters = le32_to_cpu(fe->i_clusters); | |
392 | spin_unlock(&OCFS2_I(inode)->ip_lock); | |
393 | ||
394 | status = ocfs2_journal_dirty(handle, fe_bh); | |
395 | if (status < 0) { | |
396 | mlog_errno(status); | |
397 | goto leave; | |
398 | } | |
399 | ||
400 | clusters_to_add -= num_bits; | |
401 | ||
402 | if (clusters_to_add) { | |
403 | mlog(0, "need to alloc once more, clusters = %u, wanted = " | |
404 | "%u\n", fe->i_clusters, clusters_to_add); | |
405 | status = -EAGAIN; | |
406 | reason = RESTART_TRANS; | |
407 | } | |
408 | ||
409 | leave: | |
410 | mlog_exit(status); | |
411 | if (reason_ret) | |
412 | *reason_ret = reason; | |
413 | return status; | |
414 | } | |
415 | ||
416 | static int ocfs2_extend_allocation(struct inode *inode, | |
417 | u32 clusters_to_add) | |
418 | { | |
419 | int status = 0; | |
420 | int restart_func = 0; | |
421 | int drop_alloc_sem = 0; | |
422 | int credits, num_free_extents; | |
423 | u32 prev_clusters; | |
424 | struct buffer_head *bh = NULL; | |
425 | struct ocfs2_dinode *fe = NULL; | |
426 | struct ocfs2_journal_handle *handle = NULL; | |
427 | struct ocfs2_alloc_context *data_ac = NULL; | |
428 | struct ocfs2_alloc_context *meta_ac = NULL; | |
429 | enum ocfs2_alloc_restarted why; | |
430 | struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); | |
431 | ||
432 | mlog_entry("(clusters_to_add = %u)\n", clusters_to_add); | |
433 | ||
434 | status = ocfs2_read_block(osb, OCFS2_I(inode)->ip_blkno, &bh, | |
435 | OCFS2_BH_CACHED, inode); | |
436 | if (status < 0) { | |
437 | mlog_errno(status); | |
438 | goto leave; | |
439 | } | |
440 | ||
441 | fe = (struct ocfs2_dinode *) bh->b_data; | |
442 | if (!OCFS2_IS_VALID_DINODE(fe)) { | |
443 | OCFS2_RO_ON_INVALID_DINODE(inode->i_sb, fe); | |
444 | status = -EIO; | |
445 | goto leave; | |
446 | } | |
447 | ||
448 | restart_all: | |
449 | BUG_ON(le32_to_cpu(fe->i_clusters) != OCFS2_I(inode)->ip_clusters); | |
450 | ||
451 | mlog(0, "extend inode %"MLFu64", i_size = %lld, fe->i_clusters = %u, " | |
452 | "clusters_to_add = %u\n", | |
453 | OCFS2_I(inode)->ip_blkno, i_size_read(inode), | |
454 | fe->i_clusters, clusters_to_add); | |
455 | ||
456 | handle = ocfs2_alloc_handle(osb); | |
457 | if (handle == NULL) { | |
458 | status = -ENOMEM; | |
459 | mlog_errno(status); | |
460 | goto leave; | |
461 | } | |
462 | ||
463 | num_free_extents = ocfs2_num_free_extents(osb, | |
464 | inode, | |
465 | fe); | |
466 | if (num_free_extents < 0) { | |
467 | status = num_free_extents; | |
468 | mlog_errno(status); | |
469 | goto leave; | |
470 | } | |
471 | ||
472 | if (!num_free_extents) { | |
473 | status = ocfs2_reserve_new_metadata(osb, | |
474 | handle, | |
475 | fe, | |
476 | &meta_ac); | |
477 | if (status < 0) { | |
478 | if (status != -ENOSPC) | |
479 | mlog_errno(status); | |
480 | goto leave; | |
481 | } | |
482 | } | |
483 | ||
484 | status = ocfs2_reserve_clusters(osb, | |
485 | handle, | |
486 | clusters_to_add, | |
487 | &data_ac); | |
488 | if (status < 0) { | |
489 | if (status != -ENOSPC) | |
490 | mlog_errno(status); | |
491 | goto leave; | |
492 | } | |
493 | ||
494 | /* blocks peope in read/write from reading our allocation | |
495 | * until we're done changing it. We depend on i_sem to block | |
496 | * other extend/truncate calls while we're here. Ordering wrt | |
497 | * start_trans is important here -- always do it before! */ | |
498 | down_write(&OCFS2_I(inode)->ip_alloc_sem); | |
499 | drop_alloc_sem = 1; | |
500 | ||
501 | credits = ocfs2_calc_extend_credits(osb->sb, fe, clusters_to_add); | |
502 | handle = ocfs2_start_trans(osb, handle, credits); | |
503 | if (IS_ERR(handle)) { | |
504 | status = PTR_ERR(handle); | |
505 | handle = NULL; | |
506 | mlog_errno(status); | |
507 | goto leave; | |
508 | } | |
509 | ||
510 | restarted_transaction: | |
511 | /* reserve a write to the file entry early on - that we if we | |
512 | * run out of credits in the allocation path, we can still | |
513 | * update i_size. */ | |
514 | status = ocfs2_journal_access(handle, inode, bh, | |
515 | OCFS2_JOURNAL_ACCESS_WRITE); | |
516 | if (status < 0) { | |
517 | mlog_errno(status); | |
518 | goto leave; | |
519 | } | |
520 | ||
521 | prev_clusters = OCFS2_I(inode)->ip_clusters; | |
522 | ||
523 | status = ocfs2_do_extend_allocation(osb, | |
524 | inode, | |
525 | clusters_to_add, | |
526 | bh, | |
527 | handle, | |
528 | data_ac, | |
529 | meta_ac, | |
530 | &why); | |
531 | if ((status < 0) && (status != -EAGAIN)) { | |
532 | if (status != -ENOSPC) | |
533 | mlog_errno(status); | |
534 | goto leave; | |
535 | } | |
536 | ||
537 | status = ocfs2_journal_dirty(handle, bh); | |
538 | if (status < 0) { | |
539 | mlog_errno(status); | |
540 | goto leave; | |
541 | } | |
542 | ||
543 | spin_lock(&OCFS2_I(inode)->ip_lock); | |
544 | clusters_to_add -= (OCFS2_I(inode)->ip_clusters - prev_clusters); | |
545 | spin_unlock(&OCFS2_I(inode)->ip_lock); | |
546 | ||
547 | if (why != RESTART_NONE && clusters_to_add) { | |
548 | if (why == RESTART_META) { | |
549 | mlog(0, "restarting function.\n"); | |
550 | restart_func = 1; | |
551 | } else { | |
552 | BUG_ON(why != RESTART_TRANS); | |
553 | ||
554 | mlog(0, "restarting transaction.\n"); | |
555 | /* TODO: This can be more intelligent. */ | |
556 | credits = ocfs2_calc_extend_credits(osb->sb, | |
557 | fe, | |
558 | clusters_to_add); | |
559 | status = ocfs2_extend_trans(handle, credits); | |
560 | if (status < 0) { | |
561 | /* handle still has to be committed at | |
562 | * this point. */ | |
563 | status = -ENOMEM; | |
564 | mlog_errno(status); | |
565 | goto leave; | |
566 | } | |
567 | goto restarted_transaction; | |
568 | } | |
569 | } | |
570 | ||
571 | mlog(0, "fe: i_clusters = %u, i_size=%"MLFu64"\n", | |
572 | fe->i_clusters, fe->i_size); | |
573 | mlog(0, "inode: ip_clusters=%u, i_size=%lld\n", | |
574 | OCFS2_I(inode)->ip_clusters, i_size_read(inode)); | |
575 | ||
576 | leave: | |
577 | if (drop_alloc_sem) { | |
578 | up_write(&OCFS2_I(inode)->ip_alloc_sem); | |
579 | drop_alloc_sem = 0; | |
580 | } | |
581 | if (handle) { | |
582 | ocfs2_commit_trans(handle); | |
583 | handle = NULL; | |
584 | } | |
585 | if (data_ac) { | |
586 | ocfs2_free_alloc_context(data_ac); | |
587 | data_ac = NULL; | |
588 | } | |
589 | if (meta_ac) { | |
590 | ocfs2_free_alloc_context(meta_ac); | |
591 | meta_ac = NULL; | |
592 | } | |
593 | if ((!status) && restart_func) { | |
594 | restart_func = 0; | |
595 | goto restart_all; | |
596 | } | |
597 | if (bh) { | |
598 | brelse(bh); | |
599 | bh = NULL; | |
600 | } | |
601 | ||
602 | mlog_exit(status); | |
603 | return status; | |
604 | } | |
605 | ||
606 | /* Some parts of this taken from generic_cont_expand, which turned out | |
607 | * to be too fragile to do exactly what we need without us having to | |
608 | * worry about recursive locking in ->commit_write(). */ | |
609 | static int ocfs2_write_zero_page(struct inode *inode, | |
610 | u64 size) | |
611 | { | |
612 | struct address_space *mapping = inode->i_mapping; | |
613 | struct page *page; | |
614 | unsigned long index; | |
615 | unsigned int offset; | |
616 | struct ocfs2_journal_handle *handle = NULL; | |
617 | int ret; | |
618 | ||
619 | offset = (size & (PAGE_CACHE_SIZE-1)); /* Within page */ | |
620 | /* ugh. in prepare/commit_write, if from==to==start of block, we | |
621 | ** skip the prepare. make sure we never send an offset for the start | |
622 | ** of a block | |
623 | */ | |
624 | if ((offset & (inode->i_sb->s_blocksize - 1)) == 0) { | |
625 | offset++; | |
626 | } | |
627 | index = size >> PAGE_CACHE_SHIFT; | |
628 | ||
629 | page = grab_cache_page(mapping, index); | |
630 | if (!page) { | |
631 | ret = -ENOMEM; | |
632 | mlog_errno(ret); | |
633 | goto out; | |
634 | } | |
635 | ||
636 | ret = ocfs2_prepare_write(NULL, page, offset, offset); | |
637 | if (ret < 0) { | |
638 | mlog_errno(ret); | |
639 | goto out_unlock; | |
640 | } | |
641 | ||
642 | if (ocfs2_should_order_data(inode)) { | |
643 | handle = ocfs2_start_walk_page_trans(inode, page, offset, | |
644 | offset); | |
645 | if (IS_ERR(handle)) { | |
646 | ret = PTR_ERR(handle); | |
647 | handle = NULL; | |
648 | goto out_unlock; | |
649 | } | |
650 | } | |
651 | ||
652 | /* must not update i_size! */ | |
653 | ret = block_commit_write(page, offset, offset); | |
654 | if (ret < 0) | |
655 | mlog_errno(ret); | |
656 | else | |
657 | ret = 0; | |
658 | ||
659 | if (handle) | |
660 | ocfs2_commit_trans(handle); | |
661 | out_unlock: | |
662 | unlock_page(page); | |
663 | page_cache_release(page); | |
664 | out: | |
665 | return ret; | |
666 | } | |
667 | ||
668 | static int ocfs2_zero_extend(struct inode *inode, | |
669 | u64 zero_to_size) | |
670 | { | |
671 | int ret = 0; | |
672 | u64 start_off; | |
673 | struct super_block *sb = inode->i_sb; | |
674 | ||
675 | start_off = ocfs2_align_bytes_to_blocks(sb, i_size_read(inode)); | |
676 | while (start_off < zero_to_size) { | |
677 | ret = ocfs2_write_zero_page(inode, start_off); | |
678 | if (ret < 0) { | |
679 | mlog_errno(ret); | |
680 | goto out; | |
681 | } | |
682 | ||
683 | start_off += sb->s_blocksize; | |
684 | } | |
685 | ||
686 | out: | |
687 | return ret; | |
688 | } | |
689 | ||
690 | static int ocfs2_extend_file(struct inode *inode, | |
691 | struct buffer_head *di_bh, | |
692 | u64 new_i_size) | |
693 | { | |
694 | int ret = 0; | |
695 | u32 clusters_to_add; | |
696 | ||
697 | /* setattr sometimes calls us like this. */ | |
698 | if (new_i_size == 0) | |
699 | goto out; | |
700 | ||
701 | if (i_size_read(inode) == new_i_size) | |
702 | goto out; | |
703 | BUG_ON(new_i_size < i_size_read(inode)); | |
704 | ||
705 | clusters_to_add = ocfs2_clusters_for_bytes(inode->i_sb, new_i_size) - | |
706 | OCFS2_I(inode)->ip_clusters; | |
707 | ||
708 | if (clusters_to_add) { | |
709 | ret = ocfs2_extend_allocation(inode, clusters_to_add); | |
710 | if (ret < 0) { | |
711 | mlog_errno(ret); | |
712 | goto out; | |
713 | } | |
714 | ||
715 | ret = ocfs2_zero_extend(inode, new_i_size); | |
716 | if (ret < 0) { | |
717 | mlog_errno(ret); | |
718 | goto out; | |
719 | } | |
720 | } | |
721 | ||
722 | /* No allocation required, we just use this helper to | |
723 | * do a trivial update of i_size. */ | |
724 | ret = ocfs2_simple_size_update(inode, di_bh, new_i_size); | |
725 | if (ret < 0) { | |
726 | mlog_errno(ret); | |
727 | goto out; | |
728 | } | |
729 | ||
730 | out: | |
731 | return ret; | |
732 | } | |
733 | ||
734 | int ocfs2_setattr(struct dentry *dentry, struct iattr *attr) | |
735 | { | |
736 | int status = 0, size_change; | |
737 | struct inode *inode = dentry->d_inode; | |
738 | struct super_block *sb = inode->i_sb; | |
739 | struct ocfs2_super *osb = OCFS2_SB(sb); | |
740 | struct buffer_head *bh = NULL; | |
741 | struct ocfs2_journal_handle *handle = NULL; | |
742 | ||
743 | mlog_entry("(0x%p, '%.*s')\n", dentry, | |
744 | dentry->d_name.len, dentry->d_name.name); | |
745 | ||
746 | if (attr->ia_valid & ATTR_MODE) | |
747 | mlog(0, "mode change: %d\n", attr->ia_mode); | |
748 | if (attr->ia_valid & ATTR_UID) | |
749 | mlog(0, "uid change: %d\n", attr->ia_uid); | |
750 | if (attr->ia_valid & ATTR_GID) | |
751 | mlog(0, "gid change: %d\n", attr->ia_gid); | |
752 | if (attr->ia_valid & ATTR_SIZE) | |
753 | mlog(0, "size change...\n"); | |
754 | if (attr->ia_valid & (ATTR_ATIME | ATTR_MTIME | ATTR_CTIME)) | |
755 | mlog(0, "time change...\n"); | |
756 | ||
757 | #define OCFS2_VALID_ATTRS (ATTR_ATIME | ATTR_MTIME | ATTR_CTIME | ATTR_SIZE \ | |
758 | | ATTR_GID | ATTR_UID | ATTR_MODE) | |
759 | if (!(attr->ia_valid & OCFS2_VALID_ATTRS)) { | |
760 | mlog(0, "can't handle attrs: 0x%x\n", attr->ia_valid); | |
761 | return 0; | |
762 | } | |
763 | ||
764 | status = inode_change_ok(inode, attr); | |
765 | if (status) | |
766 | return status; | |
767 | ||
768 | size_change = S_ISREG(inode->i_mode) && attr->ia_valid & ATTR_SIZE; | |
769 | if (size_change) { | |
770 | status = ocfs2_rw_lock(inode, 1); | |
771 | if (status < 0) { | |
772 | mlog_errno(status); | |
773 | goto bail; | |
774 | } | |
775 | } | |
776 | ||
777 | status = ocfs2_meta_lock(inode, NULL, &bh, 1); | |
778 | if (status < 0) { | |
779 | if (status != -ENOENT) | |
780 | mlog_errno(status); | |
781 | goto bail_unlock_rw; | |
782 | } | |
783 | ||
784 | if (size_change && attr->ia_size != i_size_read(inode)) { | |
785 | if (i_size_read(inode) > attr->ia_size) | |
786 | status = ocfs2_truncate_file(inode, bh, attr->ia_size); | |
787 | else | |
788 | status = ocfs2_extend_file(inode, bh, attr->ia_size); | |
789 | if (status < 0) { | |
790 | if (status != -ENOSPC) | |
791 | mlog_errno(status); | |
792 | status = -ENOSPC; | |
793 | goto bail_unlock; | |
794 | } | |
795 | } | |
796 | ||
797 | handle = ocfs2_start_trans(osb, NULL, OCFS2_INODE_UPDATE_CREDITS); | |
798 | if (IS_ERR(handle)) { | |
799 | status = PTR_ERR(handle); | |
800 | mlog_errno(status); | |
801 | goto bail_unlock; | |
802 | } | |
803 | ||
804 | status = inode_setattr(inode, attr); | |
805 | if (status < 0) { | |
806 | mlog_errno(status); | |
807 | goto bail_commit; | |
808 | } | |
809 | ||
810 | status = ocfs2_mark_inode_dirty(handle, inode, bh); | |
811 | if (status < 0) | |
812 | mlog_errno(status); | |
813 | ||
814 | bail_commit: | |
815 | ocfs2_commit_trans(handle); | |
816 | bail_unlock: | |
817 | ocfs2_meta_unlock(inode, 1); | |
818 | bail_unlock_rw: | |
819 | if (size_change) | |
820 | ocfs2_rw_unlock(inode, 1); | |
821 | bail: | |
822 | if (bh) | |
823 | brelse(bh); | |
824 | ||
825 | mlog_exit(status); | |
826 | return status; | |
827 | } | |
828 | ||
829 | int ocfs2_getattr(struct vfsmount *mnt, | |
830 | struct dentry *dentry, | |
831 | struct kstat *stat) | |
832 | { | |
833 | struct inode *inode = dentry->d_inode; | |
834 | struct super_block *sb = dentry->d_inode->i_sb; | |
835 | struct ocfs2_super *osb = sb->s_fs_info; | |
836 | int err; | |
837 | ||
838 | mlog_entry_void(); | |
839 | ||
840 | err = ocfs2_inode_revalidate(dentry); | |
841 | if (err) { | |
842 | if (err != -ENOENT) | |
843 | mlog_errno(err); | |
844 | goto bail; | |
845 | } | |
846 | ||
847 | generic_fillattr(inode, stat); | |
848 | ||
849 | /* We set the blksize from the cluster size for performance */ | |
850 | stat->blksize = osb->s_clustersize; | |
851 | ||
852 | bail: | |
853 | mlog_exit(err); | |
854 | ||
855 | return err; | |
856 | } | |
857 | ||
858 | static int ocfs2_write_remove_suid(struct inode *inode) | |
859 | { | |
860 | int ret; | |
861 | struct buffer_head *bh = NULL; | |
862 | struct ocfs2_inode_info *oi = OCFS2_I(inode); | |
863 | struct ocfs2_journal_handle *handle; | |
864 | struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); | |
865 | struct ocfs2_dinode *di; | |
866 | ||
867 | mlog_entry("(Inode %"MLFu64", mode 0%o)\n", oi->ip_blkno, | |
868 | inode->i_mode); | |
869 | ||
870 | handle = ocfs2_start_trans(osb, NULL, OCFS2_INODE_UPDATE_CREDITS); | |
871 | if (handle == NULL) { | |
872 | ret = -ENOMEM; | |
873 | mlog_errno(ret); | |
874 | goto out; | |
875 | } | |
876 | ||
877 | ret = ocfs2_read_block(osb, oi->ip_blkno, &bh, OCFS2_BH_CACHED, inode); | |
878 | if (ret < 0) { | |
879 | mlog_errno(ret); | |
880 | goto out_trans; | |
881 | } | |
882 | ||
883 | ret = ocfs2_journal_access(handle, inode, bh, | |
884 | OCFS2_JOURNAL_ACCESS_WRITE); | |
885 | if (ret < 0) { | |
886 | mlog_errno(ret); | |
887 | goto out_bh; | |
888 | } | |
889 | ||
890 | inode->i_mode &= ~S_ISUID; | |
891 | if ((inode->i_mode & S_ISGID) && (inode->i_mode & S_IXGRP)) | |
892 | inode->i_mode &= ~S_ISGID; | |
893 | ||
894 | di = (struct ocfs2_dinode *) bh->b_data; | |
895 | di->i_mode = cpu_to_le16(inode->i_mode); | |
896 | ||
897 | ret = ocfs2_journal_dirty(handle, bh); | |
898 | if (ret < 0) | |
899 | mlog_errno(ret); | |
900 | out_bh: | |
901 | brelse(bh); | |
902 | out_trans: | |
903 | ocfs2_commit_trans(handle); | |
904 | out: | |
905 | mlog_exit(ret); | |
906 | return ret; | |
907 | } | |
908 | ||
909 | static inline int ocfs2_write_should_remove_suid(struct inode *inode) | |
910 | { | |
911 | mode_t mode = inode->i_mode; | |
912 | ||
913 | if (!capable(CAP_FSETID)) { | |
914 | if (unlikely(mode & S_ISUID)) | |
915 | return 1; | |
916 | ||
917 | if (unlikely((mode & S_ISGID) && (mode & S_IXGRP))) | |
918 | return 1; | |
919 | } | |
920 | return 0; | |
921 | } | |
922 | ||
923 | static ssize_t ocfs2_file_aio_write(struct kiocb *iocb, | |
924 | const char __user *buf, | |
925 | size_t count, | |
926 | loff_t pos) | |
927 | { | |
928 | struct iovec local_iov = { .iov_base = (void __user *)buf, | |
929 | .iov_len = count }; | |
930 | int ret, rw_level = -1, meta_level = -1, have_alloc_sem = 0; | |
931 | u32 clusters; | |
932 | struct file *filp = iocb->ki_filp; | |
933 | struct inode *inode = filp->f_dentry->d_inode; | |
934 | loff_t newsize, saved_pos; | |
935 | #ifdef OCFS2_ORACORE_WORKAROUNDS | |
936 | struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); | |
937 | #endif | |
938 | ||
939 | mlog_entry("(0x%p, 0x%p, %u, '%.*s')\n", filp, buf, | |
940 | (unsigned int)count, | |
941 | filp->f_dentry->d_name.len, | |
942 | filp->f_dentry->d_name.name); | |
943 | ||
944 | /* happy write of zero bytes */ | |
945 | if (count == 0) | |
946 | return 0; | |
947 | ||
948 | if (!inode) { | |
949 | mlog(0, "bad inode\n"); | |
950 | return -EIO; | |
951 | } | |
952 | ||
953 | #ifdef OCFS2_ORACORE_WORKAROUNDS | |
954 | /* ugh, work around some applications which open everything O_DIRECT + | |
955 | * O_APPEND and really don't mean to use O_DIRECT. */ | |
956 | if (osb->s_mount_opt & OCFS2_MOUNT_COMPAT_OCFS && | |
957 | (filp->f_flags & O_APPEND) && (filp->f_flags & O_DIRECT)) | |
958 | filp->f_flags &= ~O_DIRECT; | |
959 | #endif | |
960 | ||
961 | down(&inode->i_sem); | |
962 | /* to match setattr's i_sem -> i_alloc_sem -> rw_lock ordering */ | |
963 | if (filp->f_flags & O_DIRECT) { | |
964 | have_alloc_sem = 1; | |
965 | down_read(&inode->i_alloc_sem); | |
966 | } | |
967 | ||
968 | /* concurrent O_DIRECT writes are allowed */ | |
969 | rw_level = (filp->f_flags & O_DIRECT) ? 0 : 1; | |
970 | ret = ocfs2_rw_lock(inode, rw_level); | |
971 | if (ret < 0) { | |
972 | rw_level = -1; | |
973 | mlog_errno(ret); | |
974 | goto out; | |
975 | } | |
976 | ||
977 | /* | |
978 | * We sample i_size under a read level meta lock to see if our write | |
979 | * is extending the file, if it is we back off and get a write level | |
980 | * meta lock. | |
981 | */ | |
982 | meta_level = (filp->f_flags & O_APPEND) ? 1 : 0; | |
983 | for(;;) { | |
984 | ret = ocfs2_meta_lock(inode, NULL, NULL, meta_level); | |
985 | if (ret < 0) { | |
986 | meta_level = -1; | |
987 | mlog_errno(ret); | |
988 | goto out; | |
989 | } | |
990 | ||
991 | /* Clear suid / sgid if necessary. We do this here | |
992 | * instead of later in the write path because | |
993 | * remove_suid() calls ->setattr without any hint that | |
994 | * we may have already done our cluster locking. Since | |
995 | * ocfs2_setattr() *must* take cluster locks to | |
996 | * proceeed, this will lead us to recursively lock the | |
997 | * inode. There's also the dinode i_size state which | |
998 | * can be lost via setattr during extending writes (we | |
999 | * set inode->i_size at the end of a write. */ | |
1000 | if (ocfs2_write_should_remove_suid(inode)) { | |
1001 | if (meta_level == 0) { | |
1002 | ocfs2_meta_unlock(inode, meta_level); | |
1003 | meta_level = 1; | |
1004 | continue; | |
1005 | } | |
1006 | ||
1007 | ret = ocfs2_write_remove_suid(inode); | |
1008 | if (ret < 0) { | |
1009 | mlog_errno(ret); | |
1010 | goto out; | |
1011 | } | |
1012 | } | |
1013 | ||
1014 | /* work on a copy of ppos until we're sure that we won't have | |
1015 | * to recalculate it due to relocking. */ | |
1016 | if (filp->f_flags & O_APPEND) { | |
1017 | saved_pos = i_size_read(inode); | |
1018 | mlog(0, "O_APPEND: inode->i_size=%llu\n", saved_pos); | |
1019 | } else { | |
1020 | saved_pos = iocb->ki_pos; | |
1021 | } | |
1022 | newsize = count + saved_pos; | |
1023 | ||
1024 | mlog(0, "pos=%lld newsize=%"MLFu64" cursize=%lld\n", | |
1025 | saved_pos, newsize, i_size_read(inode)); | |
1026 | ||
1027 | /* No need for a higher level metadata lock if we're | |
1028 | * never going past i_size. */ | |
1029 | if (newsize <= i_size_read(inode)) | |
1030 | break; | |
1031 | ||
1032 | if (meta_level == 0) { | |
1033 | ocfs2_meta_unlock(inode, meta_level); | |
1034 | meta_level = 1; | |
1035 | continue; | |
1036 | } | |
1037 | ||
1038 | spin_lock(&OCFS2_I(inode)->ip_lock); | |
1039 | clusters = ocfs2_clusters_for_bytes(inode->i_sb, newsize) - | |
1040 | OCFS2_I(inode)->ip_clusters; | |
1041 | spin_unlock(&OCFS2_I(inode)->ip_lock); | |
1042 | ||
1043 | mlog(0, "Writing at EOF, may need more allocation: " | |
1044 | "i_size = %lld, newsize = %"MLFu64", need %u clusters\n", | |
1045 | i_size_read(inode), newsize, clusters); | |
1046 | ||
1047 | /* We only want to continue the rest of this loop if | |
1048 | * our extend will actually require more | |
1049 | * allocation. */ | |
1050 | if (!clusters) | |
1051 | break; | |
1052 | ||
1053 | ret = ocfs2_extend_allocation(inode, clusters); | |
1054 | if (ret < 0) { | |
1055 | if (ret != -ENOSPC) | |
1056 | mlog_errno(ret); | |
1057 | goto out; | |
1058 | } | |
1059 | ||
1060 | /* Fill any holes which would've been created by this | |
1061 | * write. If we're O_APPEND, this will wind up | |
1062 | * (correctly) being a noop. */ | |
1063 | ret = ocfs2_zero_extend(inode, (u64) newsize - count); | |
1064 | if (ret < 0) { | |
1065 | mlog_errno(ret); | |
1066 | goto out; | |
1067 | } | |
1068 | break; | |
1069 | } | |
1070 | ||
1071 | /* ok, we're done with i_size and alloc work */ | |
1072 | iocb->ki_pos = saved_pos; | |
1073 | ocfs2_meta_unlock(inode, meta_level); | |
1074 | meta_level = -1; | |
1075 | ||
1076 | /* communicate with ocfs2_dio_end_io */ | |
1077 | ocfs2_iocb_set_rw_locked(iocb); | |
1078 | ||
1079 | #ifdef OCFS2_ORACORE_WORKAROUNDS | |
1080 | if (osb->s_mount_opt & OCFS2_MOUNT_COMPAT_OCFS && | |
1081 | filp->f_flags & O_DIRECT) { | |
1082 | unsigned int saved_flags = filp->f_flags; | |
1083 | int sector_size = 1 << osb->s_sectsize_bits; | |
1084 | ||
1085 | if ((saved_pos & (sector_size - 1)) || | |
1086 | (count & (sector_size - 1)) || | |
1087 | ((unsigned long)buf & (sector_size - 1))) { | |
1088 | filp->f_flags |= O_SYNC; | |
1089 | filp->f_flags &= ~O_DIRECT; | |
1090 | } | |
1091 | ||
1092 | ret = generic_file_aio_write_nolock(iocb, &local_iov, 1, | |
1093 | &iocb->ki_pos); | |
1094 | ||
1095 | filp->f_flags = saved_flags; | |
1096 | } else | |
1097 | #endif | |
1098 | ret = generic_file_aio_write_nolock(iocb, &local_iov, 1, | |
1099 | &iocb->ki_pos); | |
1100 | ||
1101 | /* buffered aio wouldn't have proper lock coverage today */ | |
1102 | BUG_ON(ret == -EIOCBQUEUED && !(filp->f_flags & O_DIRECT)); | |
1103 | ||
1104 | /* | |
1105 | * deep in g_f_a_w_n()->ocfs2_direct_IO we pass in a ocfs2_dio_end_io | |
1106 | * function pointer which is called when o_direct io completes so that | |
1107 | * it can unlock our rw lock. (it's the clustered equivalent of | |
1108 | * i_alloc_sem; protects truncate from racing with pending ios). | |
1109 | * Unfortunately there are error cases which call end_io and others | |
1110 | * that don't. so we don't have to unlock the rw_lock if either an | |
1111 | * async dio is going to do it in the future or an end_io after an | |
1112 | * error has already done it. | |
1113 | */ | |
1114 | if (ret == -EIOCBQUEUED || !ocfs2_iocb_is_rw_locked(iocb)) { | |
1115 | rw_level = -1; | |
1116 | have_alloc_sem = 0; | |
1117 | } | |
1118 | ||
1119 | out: | |
1120 | if (meta_level != -1) | |
1121 | ocfs2_meta_unlock(inode, meta_level); | |
1122 | if (have_alloc_sem) | |
1123 | up_read(&inode->i_alloc_sem); | |
1124 | if (rw_level != -1) | |
1125 | ocfs2_rw_unlock(inode, rw_level); | |
1126 | up(&inode->i_sem); | |
1127 | ||
1128 | mlog_exit(ret); | |
1129 | return ret; | |
1130 | } | |
1131 | ||
1132 | static ssize_t ocfs2_file_aio_read(struct kiocb *iocb, | |
1133 | char __user *buf, | |
1134 | size_t count, | |
1135 | loff_t pos) | |
1136 | { | |
1137 | int ret = 0, rw_level = -1, have_alloc_sem = 0; | |
1138 | struct file *filp = iocb->ki_filp; | |
1139 | struct inode *inode = filp->f_dentry->d_inode; | |
1140 | #ifdef OCFS2_ORACORE_WORKAROUNDS | |
1141 | struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); | |
1142 | #endif | |
1143 | ||
1144 | mlog_entry("(0x%p, 0x%p, %u, '%.*s')\n", filp, buf, | |
1145 | (unsigned int)count, | |
1146 | filp->f_dentry->d_name.len, | |
1147 | filp->f_dentry->d_name.name); | |
1148 | ||
1149 | if (!inode) { | |
1150 | ret = -EINVAL; | |
1151 | mlog_errno(ret); | |
1152 | goto bail; | |
1153 | } | |
1154 | ||
1155 | #ifdef OCFS2_ORACORE_WORKAROUNDS | |
1156 | if (osb->s_mount_opt & OCFS2_MOUNT_COMPAT_OCFS) { | |
1157 | if (filp->f_flags & O_DIRECT) { | |
1158 | int sector_size = 1 << osb->s_sectsize_bits; | |
1159 | ||
1160 | if ((pos & (sector_size - 1)) || | |
1161 | (count & (sector_size - 1)) || | |
1162 | ((unsigned long)buf & (sector_size - 1)) || | |
1163 | (i_size_read(inode) & (sector_size -1))) { | |
1164 | filp->f_flags &= ~O_DIRECT; | |
1165 | } | |
1166 | } | |
1167 | } | |
1168 | #endif | |
1169 | ||
1170 | /* | |
1171 | * buffered reads protect themselves in ->readpage(). O_DIRECT reads | |
1172 | * need locks to protect pending reads from racing with truncate. | |
1173 | */ | |
1174 | if (filp->f_flags & O_DIRECT) { | |
1175 | down_read(&inode->i_alloc_sem); | |
1176 | have_alloc_sem = 1; | |
1177 | ||
1178 | ret = ocfs2_rw_lock(inode, 0); | |
1179 | if (ret < 0) { | |
1180 | mlog_errno(ret); | |
1181 | goto bail; | |
1182 | } | |
1183 | rw_level = 0; | |
1184 | /* communicate with ocfs2_dio_end_io */ | |
1185 | ocfs2_iocb_set_rw_locked(iocb); | |
1186 | } | |
1187 | ||
1188 | ret = generic_file_aio_read(iocb, buf, count, iocb->ki_pos); | |
1189 | if (ret == -EINVAL) | |
1190 | mlog(ML_ERROR, "generic_file_aio_read returned -EINVAL\n"); | |
1191 | ||
1192 | /* buffered aio wouldn't have proper lock coverage today */ | |
1193 | BUG_ON(ret == -EIOCBQUEUED && !(filp->f_flags & O_DIRECT)); | |
1194 | ||
1195 | /* see ocfs2_file_aio_write */ | |
1196 | if (ret == -EIOCBQUEUED || !ocfs2_iocb_is_rw_locked(iocb)) { | |
1197 | rw_level = -1; | |
1198 | have_alloc_sem = 0; | |
1199 | } | |
1200 | ||
1201 | bail: | |
1202 | if (have_alloc_sem) | |
1203 | up_read(&inode->i_alloc_sem); | |
1204 | if (rw_level != -1) | |
1205 | ocfs2_rw_unlock(inode, rw_level); | |
1206 | mlog_exit(ret); | |
1207 | ||
1208 | return ret; | |
1209 | } | |
1210 | ||
1211 | struct inode_operations ocfs2_file_iops = { | |
1212 | .setattr = ocfs2_setattr, | |
1213 | .getattr = ocfs2_getattr, | |
1214 | }; | |
1215 | ||
1216 | struct inode_operations ocfs2_special_file_iops = { | |
1217 | .setattr = ocfs2_setattr, | |
1218 | .getattr = ocfs2_getattr, | |
1219 | }; | |
1220 | ||
1221 | struct file_operations ocfs2_fops = { | |
1222 | .read = do_sync_read, | |
1223 | .write = do_sync_write, | |
1224 | .sendfile = generic_file_sendfile, | |
1225 | .mmap = ocfs2_mmap, | |
1226 | .fsync = ocfs2_sync_file, | |
1227 | .release = ocfs2_file_release, | |
1228 | .open = ocfs2_file_open, | |
1229 | .aio_read = ocfs2_file_aio_read, | |
1230 | .aio_write = ocfs2_file_aio_write, | |
1231 | }; | |
1232 | ||
1233 | struct file_operations ocfs2_dops = { | |
1234 | .read = generic_read_dir, | |
1235 | .readdir = ocfs2_readdir, | |
1236 | .fsync = ocfs2_sync_file, | |
1237 | }; |